STATIC AND DYNAMIC ANALYSIS OF SUBMARINE OUTFALL STRUCTURE

Resumo

Submarine outfalls are composed of an oceanic disposal system, represented by a tube that transports
domestic effluents to the sea. The discharge of sewage by underwater outfalls is shown as an efficient alternative
for the final destination of sanitary effluents since it has a high capacity to disperse and purify organic materials
in the marine environment. To design a submarine outfall as a method of disposal of effluents is necessary to
evaluate several factors that can influence the behavior of the structure, such as the forces due to sea currents.
Therewith, the study presents, through numerical modeling in SAP2000 software based on the finite element
method, a comparison between static and dynamic model, in a submarine outfall. The hydrodynamic forces were
applied by Morison’s equation for two load case, multi-step static parameters were employed in the static model
and the time history was putted in the dynamic model. The results were analyzed by means of the displacement of
the structure by varying the height and period of the waves. The analysis presents significant differences in relation
to the static and dynamic of structure comparison, mainly in the peak of the resonance.